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  • I contacted them because I wanted to put a steel beam in taking out one of my jack posts. I mentioned to them about a 10 inch flange being that I have a modular home and the two halves coming together pretty much equal that. They did not like this idea and all I heard was how Bill was almost an engineer and they discussed how my jack posts were 6 inch. I did not pay attention to the beam when it arrived and it ended up being 4 inch flange. that was never written in any email we discussed. When I came home I was told of one of my jack posts w cricked and it was okay by one of their workers. they had used my old holes. I was told they did not have the right tools to put them in straight in an email. It appeared to me they did. Also I had a light cam hanging by its wire. they took a 2 x 10 and ran it down the middle with the grain going the same way, but left spaces where the jack posts used to be. I already have a crack in the wood where the 4 inch flange steel beam touches the wood. The 2 x 10 is shimmed every 16 inches. Wood will warp. To stabilize they put 4 2 x 6 beams at angles. One though is pushed against a water line. if the beam shifts I might have a water leak. The other is covering part of an electrical hole for wires. If that shifts I am afraid it will do a lot of damage. We were emailing each other for awhile and they decided I owe them 90 percent of the job. the original amount was 2389 and if I want them to move my ductwork, wires, and radon pipe it would be an additional 250. I did it myself, but in the final bill they decided to add that price. Do not hire them. I feel they do not listen.
    I had an inspection done and this is what he wrote.
      Upon inspection there was found a W12 x 22 Beam spanning roughly 16' that was used to replace a basement postthat had a design load of 11,702 lbs. per Wick Homes Model 454M-E drawing dated 10-14-2004.  The basement is of the Superior Walls design and manufacture.  
        The minimum load requirements for the posts under the home per Wicks drawings is 11,702 lbs.
    Three of the original posts were removed as they were too long to accommodate the 12" depth of the newly installed beam.  The design load rating of the posts that were removed was taken from the postand is 13,700 lbs.  The allowable load rating of the new posts used to support the 12 x 22 beam is per their labeling 12,100 lbs.
       Since the two new posts replaced existing posts that needed a minimum oad capacity of 11,702 lbs. plus the additional load that was supported by the post that was removed, the load on each of th posts supporting the beam can be 11,700/2 +11,700= 17,550 lbs.  Plus 1/2 the weight o f the new beam = (22lbs./ft x 16 feet)/ 2 = 176 lbs for a total load per post of 17,726 lbs.
        Thus the newly installed posts are undersized according to the allowable load rating found on the post's label.  17,726 lbs-12,100 lbs = 5626 shy of the design load required per post.
       Note the load from the home is based on the floor and roof load as this is a manufactured dwelling which transfers 1/2 of the roof load down throuhg the center of the home to the row of posts in the basement.  This is common for the manufactured dwellings and homes as the roof trusses are not designed and built to span from the two exterior walls of the dwelling, but instead each half of the home's roof trusses spans fromthe exterior walls to the middle wall, transferring half of the roof load from each half of the home down through the center of the home to the posts in the basement.  
       As one can imagine  the  footings for the posts should have been investigated to insure they can take the 50% additional load on each of hte two footings.  Nothing was done during the inspection to ascertain the size of those footings.  as the concrete floor covers the footings.  
       Calculations were done to check the size of the steel w12 x 22 beam.  Those calculations were done by hand and checked using a PC program.   Copies  of those calculations are attached.  Note that the beam's allowabel stress iin bending was OK as was the web compressive forces where the web joins the flange at the supports.  Calculations did show the need for a web stiffener.  None was provided by the builder.  Also the connection of the post to the beam is questionable as the top of the new posts are not designed to provide lateral support to beam.  The builder did attempt to provide lateral support to the bottom flange of the beam, but the works looks questionable and amateurish.  If I were the Authority Having Jurisdiction (Building Inspector) I would not accept that means of providing lateral support in that area unless the builder could show it to conforms with standard practices by providing written documentation showing the technique used is common in building trades and that the bearing plate on the post is sufficiently well attached to resist any lateral forces.  
       The marriage beam in the home is laterally supported along both its top and bottom by floor joists wihich frame int it.  The W12 x 22 steel beam is only laterally supported along its top flange as installed.  
        Even though the beam size selected can take the loading numbers imposed on it by the home if it had web stiffeners at the supports, the means used to transfer the loads from the marriage beam in the basement to the W12 x 22 beam fails to comply with NDS 3.8.2 (the NDS is adopted in the UDC in SPS320.24, the former Comm 20.24) as a 2 x 10 is bolted to the top flange of the W 12 x 22 and is nailed to the bottom of the marriage beam with the grain running parallel to the W 12 x 22.  this arrangement allows the 2 x 10 to overhang the W 12 x 22 by 2 1/2 inches on both sides of the beam and that induces tension in the 2 x 10 and that tension is perpendicular to the grain.  NDS 3.8.2 reads: designs that induce tension stress perpendicular to grain shall be avoided whenever possible. (See References 16 and 19).  When tension stress perpendicular to the grain cannot be avoided, mechanical reinforcement sufficient to resist all such stresses shall be considered. (see References 52 and 53 for additional information).
       The width of the top flange of the W 12 x 22 is 4. 030".  There is a commonly found gap between the two marriage beams such that the width of the W12 x 22 flange just catches/supports two of the six 2 x 's that make up the marriage beam.
      The beam would have been better installed with 6" x 6" bearing plates( size per Wick drawings) attached to the beam that support the marriage beam where the posts did OR cut the 2 x 10 into pieces of sufficient length to catch the entire width of the marriage beam and arrange the 2 x 10 pieces so that the grain ran perpendicular to the marriage beam and place the 2 x 10 pieces along the entire length of the W 12 x 22 which would have complied with NDS 3.8.2
           

       
    - Curt E.
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